A pepperoni pizza, a detailed version and a more simple one, and a pizza box skinned. The more detailed one has the pepperoni as a separated mesh.

Tris:
Whole pizza detailed: 1696 tris
Whole pizza simple: 160 tris
Cutted pizza detailed: 1366 tris
Cutted pizza simple: 150 tris
Slice detailed: 222 tris
Slice simple: 30 tris
Box: 116 tris

Rendered in Unity engine using the standard shader.